Video playback interruption on July 20, 2021

If you experienced video playback interruption (video not playing) or being blocked - the issue has been resolved

Due to a service interruption with our video host site, our videos were temporarily unavailable for the several hours on July 20th, 2021. If you experienced video playback interruption, please rest assured that the issue has been resolved. We invite you to return learning in the course and we apologize for any inconvenience.